DT-311A & DT-315A Stroboscope
Instruction Manual
DT-311A
DT-315A
Congratulations on your purchase of a Shimpo DT-311A or DT-315A stroboscope/digital tachometer. We trust you will enjoy many years of professional results from your Shimpo product.
Please read the entire instruction manual thoroughly before initial set-up and operation; the information contained herein will aid you in operating your Shimpo stroboscope safely and with excellent results.
If you have any questions regarding our product(s), call your local Shimpo representative or contact Shimpo Instruments directly for assistance.
Inspection/Standard Accessories
If upon delivery shipping damage is detected, do not operate the unit. Notify shipping carrier immediately for damage claim instructions. Refer to nameplate and record serial number for future reference. Items included with the DT-311A/DT-315A are:
•(1) Handle
•(1) Flash tube removing tool
•(1) AC charger/adapter (Model 315A only)
Features and Benefits
Shimpo’s DT-311A and DT-315A stroboscopes/digital tachometers incorporate the latest microprocessor technology for visual inspection applications:
•Aluminum construction provides exceptional durability
•High polish and focused reflector eliminates “blind” viewing areas
•External trigger allows unit to be automatically synchronized with equipment
•Continuous duty cycle eliminates need to shut down for cooling
•Phase shift allows visual analysis of rotating/reciprocating objects
•High accuracy ( ± 0.01% of reading ) is ideal for QC inspection and process control
•Synchronous output enables strobe to drive other strobes
•Flash timer control conserves flash tube life
Important Safety Instructions
Do not operate or store instrument in the following places: explosive areas; near water, oil, dust, or chemicals; areas where temperature is above 104°F (40°C).
Do not look at the emitted light for long periods of time; it can be harmful to the eyes.
Do not disassemble or repair unit while in operation.
Set-up
The DT-311A and DT-315A may be operated handheld or else mounted on a tripod for added convenience.
To mount the strobe on a tripod (or any other mounting surface), use screw ¼ -20unc, length 8mm or shorter for the tripod screw hole on the bottom.
Display P |
anel |
1 |
4 |
2 |
3 |
1.LED display: Displays function and value
2.EXT: External mode indicator
3.INT: Internal mode indicator
4.B-CH: Battery charge indicator (DT-315A only)
5.FPM: Flash per minute indicator
6.deg: Phase shift degree indicator
7.mSec: Millisecond delay time indicator
8.Signal switch:Switches the unit from the external mode to the internal mode (and vice-versa)
9.Display mode switch: When unit is set to the external
mode, the strobe will switch to RPM (FPM)/deg/msec each time “MODE” is depressed
RPM (FPM) Displays flashes per minute External input 0-35,000 RPM (FPM)
deg |
Displays flash delay in degrees |
msec |
Displays flash delay in msec |
10.Setter: Changes the flashing rate
11.(x2) Switch: In the internal mode, pressing “x2” doubles the flashing rate
12.(+) Switch: In the internal mode,when object appears
to be standing still, pressing “+” will give the illusion that the object is moving towards the rotating direction at a speed of 1 rotation in 6 seconds
13.( 2) Switch: In the internal mode, pressing “ 2” divides the flashing rate by two
14.(-) Switch: In the internal mode, when object appears
to be standing still, pressing “-“ will give the illusion that the object is moving in reverse at a speed of 1 rotation in 6 seconds
15.Input and output connector:
PIN #1: |
+12V |
PIN #2: |
Synch output signal |
PIN #3: |
Input signal |
PIN #4: |
0V |
16.Power cord (DT-311A) / AC adapter (DT-315A)
17.Power switch
Operation
True RPM Measurement
Shimpo stroboscopes are DUAL function instruments that give
the operator the illusion of “stopped motion” where in actuality the equipment under observation is in a moving state. By
adjusting the flash rate, equipment in motion appears to be standing still. With a slight adjustment, movement can be viewed
in apparent slow motion, which enables the operator or observer to study the process in action. All Shimpo stroboscopes can
measure rotational (RPM) or reciprocating (strokes per minute) speeds with the same high precision as with an electronic digital
tachometer.
To measure true revolutions per minute (RPM):
1.“Mark” the object to be measured by either visually noting an inherent distinguishing characteristic (such as a label,
scratch, etc.) or physically marking the object with a small piece of tape, pencil mark, etc.
2.Firmly plug in power cord.
3.Turn power switch on.
4.Turn setter from highest FPM downward.
5.The true RPM can be noted once the action appears frozen and the first single image of the “mark” appears (see chart
below and accompanying diagram for further explanation).
6.To verify RPM reading, press “ 2”; a single image should appear again.
Shaft Rotation |
Flashes |
Flashes/ |
Stopped |
(RPM) |
(RPM) |
RPM Shaft |
Images |
|
6,000 |
4 times |
4 |
|
4,500 |
3 times |
3 |
At 1,500 RPM |
3,000 |
2 times |
2 |
|
1,500 |
1 time |
1 |
|
750 |
1/2 time |
1 |
|
500 |
1/3 time |
1 |
Internal Triggering Mode
To operate the stroboscope in internal triggering mode:
1.Firmly plug in power cord.
2.Turn power switch on.
3.If internal indicator is not on, press “SIG”; the INT light will then turn on.
4.Aim light beam at object under observation. The optimal distance between the strobe and moving object is approximately 2 feet.
5.Measure RPM by turning the setter to adjust the flashing rate to the rotational speed of the object.
NOTE: To achieve a particular rate quickly, use the “x2” or “ 2” switches and then the setter for fine tuning.
NOTE: Once the internal timer has expired, the strobe will stop
flashing and the display will flash rapidly. To restart the strobe, turn power switch off, then on, and the cycle will repeat.
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